There are examples in Caesar’s Gallic Wars (Yes I know they are not Vikings!) of Celtic women with bows shooting at Romans. And there is the Leif Erikson daughter example in a few sagas that you just cited. However most historians of the Norse era dismiss the whole shield maiden thing as myth.
Now I personally would like it to be true, hot babes with swords in leather! What’s not to like!
Shieldmaidens would have looked much more like Brienne on 'Game of Thrones' than a Victoria Secret catalog...